Investigation Summary
The hijacking was initiated by Le Duc Tan, a ranger in the South Vietnamese army who had recently been demoted from captain to lieutenant. Tan and two accomplices managed to bypass security at Da Nang Airport and, once airborne, brandished two grenades to seize control of the aircraft. They demanded the crew fly to Hanoi in North Vietnam. The pilots informed the hijackers that a refueling stop was necessary and diverted toward Phan Rang Air Base. As the aircraft approached the base, the situation in the cockpit deteriorated. The pilot radioed that the hijacker was pulling the pins on his grenades. During the final approach maneuvers, the aircraft overshot its turn and entered a steep descent, suggesting either a struggle for the controls or the detonation of the explosives while the aircraft was in a vulnerable flight bank.
Final Conclusions
The crash was the direct result of unlawful interference. While the exact sequence of the final moments remains unconfirmed, evidence suggests the hijacker detonated two hand grenades in the cockpit area as the pilots attempted to land at Phan Rang. The resulting explosion or the incapacitation of the crew caused a total loss of control at an altitude of approximately 1,000 feet.
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Systems & Failure Modes
Cockpit Security
The lack of hardened cockpit doors in 1974 allowed the hijacker easy access to the flight deck to threaten the crew.
Airport Ground Security
The hijacker used his military status to bypass security checkpoints at Da Nang Airport while carrying explosives.
Interesting Facts
- 01The hijacker was a South Vietnamese army ranger who had been demoted for the theft of two cars.
- 02The aircraft involved was a Boeing 727-121C manufactured in 1968.
- 03All 75 people on board, including 67 passengers and 8 crew members, perished in the crash.
- 04The aircraft crashed into a rice paddy field near the air base and was completely destroyed by fire.
- 05The same aircraft (XV-NJC) had previously been involved in a forced landing incident in Bangkok in 1973.
Safety Actions & Advisories
Security Screening Reinforcement
The incident highlighted the vulnerability of domestic flights to military personnel carrying weapons, leading to calls for stricter screening of all passengers regardless of rank or status.